Method of making annular bearings.



PATENTED AUG. 11, 1908..

s. s. EVELAND. METHOD OF-MAKING ANNULAR BEARINGS.

APPLICATION FILED NOV. 26,1906.

Salim! -S- SAMUEL S. EVELAND, OF PHILADELPHIA, PENNSYLVANIA.

METHOD OF MAKING ANNULAR BEARINGS.

Specification of Letters Patent.

Application filed November 26, 1906.

Patented Aug. 11, 1908.

Serial No. 345,076.

To all whom it may concern:

Be it known that I, SAMUEL S. EVELAND, a citizen of the United States,and a resident of Philadelphia, in the county of Philadelphia and Stateof Pennsylvania, have invented a new and useful Method of Making AnnularBearings, of which the following is a specification.

The ring or annular ball bearing so-called, consisting of inner andouter rings with confronting grooves or races for the balls has becomevery popular with the trade and has gone into extensive use particularlyon automobile work. It is essential in this type of bearing that thegrooves or races shall be in perfect coincidence, otherwise heating andother troubles arise causing the bearing to rapidly deteriorate. Priorto my invention the practice was to make the rings from tubular blanksand to separately form and grind the grooves or races. This practice wasdisadvantageous because it was expensive as to time, labor andmaterials, and because it offered no assurance as to the accuracy, anduniformity of the roduct.

,The principal objects of t e invention are to obvlate the defects anddisadvantages heretofore encountered and to provide a method of makingannular bearings at considerable less cost than heretofore and in whichthe grooves or races shall be absolutely coincident.

Briefly stated, the invention consists in preparing an annealed steelblank, in cutting away portions of the end of the blank to formconcentric tubular parts, sleeves or projecting rings, and while therings are in juxtaposition and still a part of the blank insimultaneously forming the confronting grooves or races, separating therings from the blank and finally hardening, tempering and grinding thesame.

The nature and characteristic features of the invention will be morereadily understood from the following description taken in connectionwith the accompanying drawings, forming part hereof wherein- Figure -1,represents a cylindrical blank. Fig. 2, represents the same annealed.Fig. 3, represents the next step of dressing the blank to form theperiphery of the outer ring. Fig. 4, is a sectional view of the end ofthe blank showing the same counterbored to form the inner periphery ofthe inner ring. Fig. 5, shows the blank after the completion of the nextstep that of making an annular recess or channel to form the outerperiphery of the inner ring and the inner periphery of the outer ring.Fig. 6, is a sectiona view of the blank after the next step of formingthe coincident grooves or races. Fig. 7, is a sectional view of theblank and rings detached. Fig. 8, is a sectional perspective view of therings, and Fig. 9, is a view of the rings with balls applied.

.In the ractice of the invention I prepare an annealed steel blank a,preferably highcarbon steel. I then dress it down to the desireddiameter to form the periphery of the outer ring and counterbore the endof the blank whereby a tubular shank or sleeve 7), is formed asrepresented in Fig. 4. I next out an annular recess or channel 0, insaid sleeve, whereby are formed the outer periphery of the inner sleevee, and the inner periphery of the outer sleeve (1. These sleevesconstitute respectively the outer and inner rings of an annular bearing,and the next step is to form the confronting grooves or races. This isaccomplished while the sleeves d and e, are still integral with theblank (Fig. 6) whereby there is insured absolute accuracy andcoincidence in the grooves. The sleeves or rings are next detached fromthe blank, as illustrated in Fig. 7 and finally they are hardened andtempered and ground and otherwise prepared for the assemblage of theballs.

Having described the nature and objects of the invention, what I claimas new and desire to secure by Letters Patent is:

The improved com ound process of manufacturing mate annu ar bearingrings herein described, consisting in preparing an annealed steel blank,forming a ortion of the blank into the periphery of the outer ring,forming the inner periphery of the inner ring by counter-boring the endof the blank,

forming the inner periphery of the outer ring and the outer periphery ofthe inner ring by cutting an annular recess or channel in the Intestimony whereof I have hereunto end of the blank, forming racfeshorgroovels iln signed my name in the presence of Witnesses.

the confronting eri heries 0 t e rings W 1i e still an integral iart ofthe blank, and sepa- SAMUEL EVELAND 5 rating the rings from the blank,said steps being performed progressively While the annealed blank issoft.

Witnesses:

I JAs. A. RICH OND,

KATHERINE RICHMOND.

